CN102315912A - Method for providing pre-encoding matrix, method for providing decoding matrix and base station - Google Patents

Method for providing pre-encoding matrix, method for providing decoding matrix and base station Download PDF

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CN102315912A
CN102315912A CN2010102175623A CN201010217562A CN102315912A CN 102315912 A CN102315912 A CN 102315912A CN 2010102175623 A CN2010102175623 A CN 2010102175623A CN 201010217562 A CN201010217562 A CN 201010217562A CN 102315912 A CN102315912 A CN 102315912A
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matrix
subscriber equipment
base station
diagonal
channel matrix
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CN102315912B (en
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刘锋
陈大庚
张佳胤
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The embodiment of the invention discloses a method for providing a pre-encoding matrix, a method for providing a decoding matrix, and a base station. The method for providing the pre-encoding matrix comprises the following steps: the base station obtains an up channel matrix corresponding to each piece of user equipment; the base station combines the obtained up channel matrixes into a channel matrix; the base station decomposes the channel matrix by using a block diagonal singular value decomposition method to obtain a unitary matrix, wherein the diagonal line of the unitary matrix comprises block diagonal matrixes with the quantity same as that of the user equipment, and the block diagonal matrixes on the diagonal line correspond to the user equipment one by one; and the base station supplies each block diagonal matrix or one line of elements in each block diagonal matrix to the corresponding user equipment. By applying the technical scheme of the embodiment, the channel matrix is decomposed by using the block diagonal singular value decomposition method, and each piece of user equipment can respectively carry out pre-encoding processing or decoding processing by adopting the obtained diagonal matrix information, so that the performance of an MU-MIMO (multi-user multiple input multiple output) system can be improved.

Description

Pre-coding matrix method, decoding matrix be provided method and base station be provided
Technical field
The present invention relates to the communication technology, relate in particular to pre-coding matrix method, decoding matrix be provided method and base station be provided.
Background technology
In communication system, precoding technique can effectively improve the receptivity of system, and concrete method is that transmitter uses pre-coding matrix that the information of sending is handled, and obtains sending signal.Pre-coding matrix obtains after can decomposing channel matrix through the method for matrix decomposition.
Matrix disassembling method commonly used is singular value decomposition (SVD, Singular Value Decomposition) method and ORTHOGONAL TRIANGULAR DECOMPOSITION (QRD, QR Decomposition) method.
Through the SVD method, can with arbitrary matrix decomposition the product of a unitary matrice, a diagonal matrix and another unitary matrice, that is: H=U ∑ V H, wherein, H is for being decomposed matrix (being above-mentioned channel matrix), and U, V are unitary matrice, and ∑ is a diagonal matrix.
Through the QRD method, can with arbitrary matrix decomposition the product of a unitary matrice and a triangular matrix, that is: H=QR, wherein, H is for being decomposed matrix (being above-mentioned channel matrix), and Q is a unitary matrice, and R is the triangle battle array.
For single user's multiple-input and multiple-output (SU-MIMO, Single User Multiple Input Multiple Output) system, its signal model can be expressed as:
Y＝HX+N
Wherein, Y is the signal that receiver receives, and H is mimo channel matrix (the present invention abbreviates channel matrix as), and X is the signal (being above-mentioned transmission signal) that transmitter sends, and N is a white noise.
After obtaining V through the SVD method, transmitter can multiply each other with the information s of V and transmission, that is, transmitter carries out precoding processing to the information s that sends, and the signal V that obtains sending is specially: X=V*s.Receiver detects Y after receiving signal Y, obtains detection signal,, uses U that is H(conjugation means of U) multiplies each other with Y, channel matrix H decomposed obtain having complete glitch-free parallel sub channel ∑ each other, is specially:
s ^ = U H Y = U H HX + U H N = U H UΣ V H X + N ~
= U H UΣ V H ( Vs ) + N ~ = Σs + N ~
Because ∑ is a diagonal matrix, so the information s of transmission (vector) has been transferred to receiver through the mode of independent parallel.
Through the QRD method, receiver is used Q HMultiply by the signal Y that receives, channel matrix H is decomposed the parallel sub channel R that obtains having unidirectional interference, receiver is eliminated interference through the complexity that serial interference elimination (SIC, SuccessiveInterference Cancellation) technology just can be lower.The detection signal of receiver is:
s ^ = Q H Y = Q H QRX + Q H N = RX + N ~
Because R is a triangular matrix, so, can, other information detect successively after eliminating the interference that has detected information then through detecting the information that does not have interference in advance.
Can know by above-mentioned SVD method and QRD method, for the SU-MIMO system, owing to only relate to a subscriber equipment (UE; User Equipment) transceiver channel matrix; So transmitter or receiver can obtain the channel information between all antennas, and carry out Combined Treatment.And at multi-user's multiple-input and multiple-output (MU-MIMO; Multi-User Multiple Input Multiple Output) in the system; What relate to is that a plurality of subscriber equipmenies are received and sent messages; Being limited between existing subscriber equipment, a plurality of subscriber equipment can't interactive information, so, can't know channel information to each other between a plurality of subscriber equipmenies.So present SVD method that is applicable to SU-MIMO and QRD method all can not be used for the transmit-receive combination of MU-MIMO system to be handled, and causes also not being applicable at present the precoding processing scheme of MU-MIMO system.
Summary of the invention
What the embodiment of the invention provided pre-coding matrix provides method and base station, and so that the precoding processing that is applicable to the MU-MIMO system to be provided, technical scheme is following:
The embodiment of the invention provides a kind of method that provides of pre-coding matrix, be applicable to subscriber equipment in multi-user's multiple-input and multiple-output MU-MIMO system before base station transmission information, the base station provides the scene of pre-coding matrix to subscriber equipment, said method comprises:
The base station obtains the corresponding up channel matrix of each subscriber equipment;
Said base station is combined into channel matrix with the up channel matrix group of obtaining;
Piece diagonal angle singular value decomposition method is used in said base station, and channel matrix is decomposed, and obtains unitary matrice, comprises the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, and the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment;
Said base station offers corresponding subscriber equipment with the column element in each block diagonal matrix or each block diagonal matrix.
The embodiment of the invention also provides a kind of base station, is used for receiving the information that subscriber equipment sends in multi-user's multiple-input and multiple-output MU-MIMO system, before the information that receives the subscriber equipment transmission, to subscriber equipment pre-coding matrix is provided, and said base station comprises:
Acquiring unit is used to obtain the corresponding up channel matrix of each subscriber equipment;
The matrix assembled unit, the up channel matrix group that is used for said acquiring unit is obtained is combined into channel matrix;
The matrix decomposition unit is used to use piece diagonal angle singular value decomposition method, and the channel matrix that said matrix assembled unit is formed decomposes, and obtains unitary matrice, comprises the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice;
Pre-coding matrix provides the unit, and each block diagonal matrix or the column element in each block diagonal matrix of the unitary matrice that is used for said matrix decomposition unit is obtained offer corresponding subscriber equipment.
The embodiment of the invention also provides a kind of method that provides of decoding matrix, be applicable to base station in the MU-MIMO system after subscriber equipment transmission information, the base station provides the scene of decoding matrix to subscriber equipment, said method comprises:
The base station obtains the corresponding down channel matrix of each subscriber equipment;
Said base station is combined into channel matrix with the down channel matrix group of obtaining;
Said base station is carried out conjugate transpose with said channel matrix and is handled;
Piece diagonal angle singular value decomposition method is used in said base station, and the channel matrix after conjugate transpose is handled decomposes;
Channel matrix after handle conjugate transpose said base station carries out conjugate transpose to be handled, and obtains unitary matrice, comprises the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, and the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment;
Said base station offers corresponding subscriber equipment with each block diagonal matrix.
The embodiment of the invention provides another kind of base station, is used for sending information in multi-user's multiple-input and multiple-output MU-MIMO system to subscriber equipment, after subscriber equipment transmission information, sends decoding matrix to subscriber equipment, and said base station comprises:
Acquiring unit is used to obtain the corresponding down channel matrix of each subscriber equipment;
The matrix assembled unit is used for the down channel matrix group of obtaining is combined into channel matrix;
The first conjugate transpose processing unit is used for that said channel matrix is carried out conjugate transpose and handles;
The matrix decomposition unit is used to use piece diagonal angle singular value decomposition method, and the channel matrix after conjugate transpose is handled decomposes;
The second conjugate transpose processing unit; Being used for that the channel matrix after the conjugate transpose processing is carried out conjugate transpose handles; Obtain unitary matrice, comprise the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment;
Pre-coding matrix provides the unit, is used for each block diagonal matrix is offered corresponding subscriber equipment.
Use embodiment of the invention technical scheme; Use piece diagonal angle singular value decomposition method that channel matrix is decomposed, wherein, the unitary matrice that obtains through decomposition; Comprise the block diagonal matrix identical on its diagonal with subscriber equipment quantity; Each block diagonal matrix information is offered corresponding user equipment respectively, and each subscriber equipment can adopt resulting diagonal matrix information to carry out precoding or decoding processing respectively, makes the performance of MU-MIMO system improve.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 provides method flow diagram for a kind of pre-coding matrix of the embodiment of the invention;
Fig. 2 is the performance simulation figure of the embodiment of the invention;
Fig. 3 is another performance simulation figure of the embodiment of the invention;
Fig. 4 is the structural representation of a kind of base station of the embodiment of the invention;
Fig. 5 is the method flow diagram that provides of a kind of decoding matrix of the embodiment of the invention;
Fig. 6 is the structural representation of the another kind of base station of the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Because technical scheme of the present invention all relates to piece diagonal angle singular value decomposition (BD-SVD, Block Diagonal Singular Value Decomposition) method, so at first introduce BD-SVD method provided by the invention.
For dimension is the channel matrix H of M * N, and its total M is capable, N row, can H be regarded as the vector of N M * 1, be defined as respectively vector 1 ... vectorial N, with the vector set 1 ..., N} is divided into the individual mutually disjoint subclass of K, wherein, each subclass is used μ kExpression:
μ k＝{N k-1+1，...，N k}，
Therefore have:
{ 1 , . . . , N } = ∪ k = 1 K μ k = ∪ k = 1 K { N k - 1 + 1 , . . . , N k }
Wherein, M, N and K are positive integer, and in the present invention, K is the quantity of subscriber equipment, N 0=0, N k=N, N kBe positive integer less than N;
H is carried out obtaining after BD-SVD decomposes:
H＝U∑V H，
Wherein, U is the unitary matrice of M * M, and V is the unitary matrice of N * N, and V is a block diagonal matrix, and ∑ is the upper triangular matrix with block diagonalization character of M * N;
V is expressed as:
Figure BSA00000170719400052
Wherein,
Figure BSA00000170719400053
For with μ kCorresponding unitary matrice;
∑ is expressed as:
Figure BSA00000170719400054
Wherein,
Figure BSA00000170719400055
For with μ kCorresponding diagonal matrix, * be the sub-piece of non-zero; Obtain at last:
Figure BSA00000170719400062
Special, when K=1, BD-SVD is exactly SVD, and at this moment, ∑ is a diagonal matrix.When K=N, BD-SVD is exactly QRD, and at this moment, ∑ is a upper triangular matrix, and V is a unit matrix.
Can obtain
Figure BSA00000170719400063
and ∑ in the following manner:
S1: make k=1, H=H, P are unit matrix, preserve original channel matrix H t=H;
S2: H is divided, obtain Be about to H and be divided into 2 parts, a wherein preceding part
Figure BSA00000170719400065
The expression H in μ kCorresponding column vector part.For example, set μ k=1,2,3}, then
Figure BSA00000170719400066
For the among the H 1,2, the vector of 3} row, a back part
Figure BSA00000170719400067
Remove among the expression H 1,2, other column vectors of 3} row;
S3: carried out singular value decomposition SVD, obtain
Figure BSA00000170719400069
S4: obtain
Figure BSA000001707194000610
Figure BSA000001707194000611
Wherein, U t(:, 1:length (μ k)) the 1st among the representing matrix Ut be to length (μ k) row, length (μ k) for gathering μ kSize;
S5: order
Figure BSA000001707194000612
k = k +1;
S6: if H is not empty or k≤K, then return S2, otherwise, change S7;
S7: obtain ∑=U H* Ht*V.
The embodiment of the invention both considered subscriber equipment in the MU-MIMO system before base station transmission information, the base station provides the scene of pre-coding matrix to subscriber equipment, also consider base station in the MU-MIMO system after subscriber equipment transmission information, the base station provides the scene of decoding matrix to subscriber equipment.In ultra 4G (B4G, Beyond 4G) system, the base station is eNodeB.
At first the subscriber equipment from the MU-MIMO system before base station transmission information, the base station provides the angle of the scene of pre-coding matrix to subscriber equipment, the method that provides of a kind of pre-coding matrix of the present invention is described.As shown in Figure 1, this method comprises:
S101: the base station obtains the corresponding up channel matrix of each subscriber equipment.
For Long Term Evolution (LTE, Long Term Evolution) system, the base station can obtain the corresponding up channel matrix of each subscriber equipment through sounding, and sounding is a kind of channel measuring method that utilizes subscriber equipment full range band pilot signal transmitted.
The corresponding up channel matrix of subscriber equipment can be expressed as H k, k is the positive integer that is not more than K, K is the quantity of subscriber equipment.
S102: said base station is combined into channel matrix with the up channel matrix group of obtaining.
Channel matrix can be expressed as H=[H 1H 2... H K].
S103: piece diagonal angle singular value decomposition method is used in said base station; Channel matrix is decomposed; Obtain unitary matrice, comprise the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment.
Use the BD-SVD method, H is decomposed, can obtain U, ∑, V, V is above-mentioned unitary matrice, and V can be expressed as:
Figure BSA00000170719400071
S104: said base station offers corresponding subscriber equipment with the column element in each block diagonal matrix or each block diagonal matrix.
For above-mentioned V, the base station can be with V 1Offer subscriber equipment 1, with V 2 Offer subscriber equipment 2, with V KOffer subscriber equipment K.
For above-mentioned V, the base station also can be only with V 1In a column element offer subscriber equipment 1, with V 2In a column element offer subscriber equipment 2, with V KIn a column element offer subscriber equipment K.One column element is a column vector, is a kind of special matrix.
In one embodiment of the invention, the base station can be with each block diagonal matrix
Figure BSA00000170719400072
In diagonal on the maximum element of value at V kIn the corresponding accordingly row of institute offer the subscriber equipment of correspondence, that is to say,
Figure BSA00000170719400073
In a diagonal is all arranged respectively, promptly element c (1,1), c (2,2) ... form a diagonal, wherein, the row and column at (1,1) and (2,2) representative element place, the element value on the diagonal may be different, choose
Figure BSA00000170719400074
The corresponding V of peaked element kThe place row offer corresponding subscriber equipment.
In the linear receiver algorithm (like MMSE) of real system, exist between residual stream between each stream of parallel transmission and disturb, through the stream of preferred each user's transmission, can reduce the residual interference after receiver detects, thereby promote performance.For instance, up, 2 users, each user are transmitted 2 streams, under the MU-MIMO scene, have 4 streams and transmit simultaneously, interfere with each other between these 4 streams, and each stream receives the interference of other 3 streams.And in this scheme; Preferred 1 flow transmission of each user; Like this, under the MU-MIMO scene, transmit 2 streams altogether; Each stream only receives the interference of other 1 stream; And disturb between the stream between the user in preferred inhibition, promptly select diagonal entry maximum, can guarantee a flow transmission selecting active user's signal the strongest.
Through the scheme of preferred 1 stream, the scheme with respect to all stream is sent out entirely has between less stream and disturbs like this, thereby obtains preferable performance.
The base station is after subscriber equipment sends pre-coding matrix, and subscriber equipment just can use pre-coding matrix that the information of sending is carried out precoding processing.
After the base station receives the signal of a plurality of subscriber equipmenies transmissions; Need detect signal; Detection method can be the poor (MMSE of linear least mean-square; Minimal Mean Square Error) detection method also can be desirable serial interference elimination (SIC, a Successive Interference Cancellation) detection method.
The front was mentioned, and the reception signal model is Y=HX+N=HVs+N, and that need detection is s, uses above-mentioned two kinds of detection methods processing mode to received signal following:
(1) linear MMSE detects
G MMSE=(HV) H(HV (HV) H+ I/SNR) -1, wherein, I representation unit battle array, SNR representes signal to noise ratio
s ^ = G MMSE Y
(2) desirable SIC detects
Y premultiplication U to received signal HAfter, obtain:
s ^ = U H Y = U H HVs + N ~ = U H UΣ V H Vs + N ~ = Σs + N ~
Wherein,
Figure BSA00000170719400084
Utilize the character of ∑, detecting ∑ for triangular matrix KCorresponding s KAfter, on other row of ∑, eliminate ∑ KInterference obtain:
Figure BSA00000170719400091
Detect ∑ K-1Corresponding s K-1, eliminate s K-1Interference, detect all s successively.
For the base station each block diagonal matrix is offered the technical scheme of corresponding subscriber equipment, suppose to have two subscriber equipmenies, each subscriber equipment all has two antennas; Each antenna all transmits an information flow; Like this, each subscriber equipment all transmits two information flows, and the reception antenna number is 4.That is, K=2, μ k=2, s is the column vector of 4 * 1 dimensions, and the channel matrix that the channel that two subscriber equipmenies are corresponding is respectively formed is the matrix of 4 * 4 dimensions.
Calm measuring angle, relatively under different received machine (MMSE/SIC) condition, the performance of embodiment of the invention scheme and VBLAST obtains performance curve as shown in Figure 2.
Can know by Fig. 2; The receiver that adopts desirable SIC to detect can be near desirable MU-MIMO capacity; Adopt the MMSE detection can have certain interference, cause its performance performance loss to be arranged, still with respect to desirable MU-MIMO capacity; The MMSE of VBLAST detects relatively, and the SNR gain above 1dB is then arranged.
For the base station column element in each block diagonal matrix is offered the technical scheme of corresponding subscriber equipment, suppose to have two subscriber equipmenies, each subscriber equipment all has two antennas, and each subscriber equipment only transmits an information flow, and the reception antenna number is 4.Be K=2, μ k=2, s is the column vector of 2 * 1 dimensions, and the channel matrix that the channel that two subscriber equipmenies are corresponding is respectively formed is the matrix of 4 * 4 dimensions.
Calm measuring angle, relatively under different received machine (MMSE/SIC) situation, the performance of embodiment of the invention scheme and VBLAST obtains performance curve as shown in Figure 3.
Can know that by Fig. 3 under the situation that adopts linear MMSE to detect, single information flow transmits with respect to complete matrix and transmits the performance that can obtain near desirable MU-MIMO capacity, compares VBLAST, the SNR gain of 2dB is arranged.
Corresponding to the method that provides of above-mentioned pre-coding matrix, the present invention also provides a kind of base station, and this base station is used for receiving the information that subscriber equipment sends in the MU-MIMO system, before the information that receives the subscriber equipment transmission, to subscriber equipment pre-coding matrix is provided.As shown in Figure 4, this base station comprises: acquiring unit 401 is used to obtain the corresponding up channel matrix of each subscriber equipment; Matrix assembled unit 402, the up channel matrix group that is used for said acquiring unit is obtained is combined into channel matrix; Matrix decomposition unit 403 is used to use piece diagonal angle singular value decomposition method, and the channel matrix that said matrix assembled unit is formed decomposes, and obtains unitary matrice, comprises the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice; Pre-coding matrix provides unit 404, and each block diagonal matrix or the column element in each block diagonal matrix of the unitary matrice that is used for said matrix decomposition unit is obtained offer corresponding subscriber equipment.
Acquiring unit 401 specifically can utilize the channel measuring method of subscriber equipment full range band pilot signal transmitted, obtains the corresponding up channel matrix of each subscriber equipment.
Pre-coding matrix provides all elements in the row that unit 404 specifically can be used for the element place that the value on the diagonal of each block diagonal matrix is maximum to offer corresponding subscriber equipment.
Because this embodiment is corresponding with the embodiment that method is provided of above-mentioned pre-coding matrix; So; The specific descriptions of the function of each unit in the base station and the relation of cooperatively interacting can repeat no more referring to the associated description among the embodiment that method is provided of above-mentioned pre-coding matrix here.
Below the base station from the MU-MIMO system after subscriber equipment transmission information, the base station provides the angle of the scene of decoding matrix to subscriber equipment, and the method that provides of a kind of decoding matrix of the present invention is described.As shown in Figure 5, this method comprises:
S501: the base station obtains the corresponding down channel matrix of each subscriber equipment.
The base station can obtain the corresponding down channel matrix of each subscriber equipment through the measurement feedback of subscriber equipment.If the MU-MIMO system is based on time division duplex (TDD, Time Division Duplexing) system, then the base station can obtain the corresponding down channel matrix of each subscriber equipment through the uplink and downlink heterogeneite in the TDD system.
The corresponding down channel matrix of subscriber equipment can be expressed as H k, k is the positive integer that is not more than K, K is the quantity of subscriber equipment.
S502: said base station is combined into channel matrix with the down channel matrix group of obtaining.
Channel matrix can be expressed as H=[H 1H 2... H K].
S503: the conjugate transpose processing is carried out with said channel matrix in said base station, obtains H H
S504: piece diagonal angle singular value decomposition method is used in said base station, and the channel matrix after conjugate transpose is handled decomposes.
Use the BD-SVD method, to H HDecompose, can obtain:
H H=U* ∑ * V H, wherein, V is a block diagonal matrix.
S505: the channel matrix after handle conjugate transpose said base station carries out conjugate transpose to be handled; Obtain unitary matrice; Comprise the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment.
With H HCarry out conjugate transpose, obtain the decomposition variant of channel matrix H, specifically be expressed as:
H=V* ∑ H*U H, V is a block diagonal matrix.
S506: said base station offers corresponding subscriber equipment with each block diagonal matrix.
The base station all offers corresponding subscriber equipment with each block diagonal matrix among the V (being decoding matrix).
Channel matrix after handle conjugate transpose the base station carries out after conjugate transpose handles, the inverse matrix of employed pre-coding matrix, i.e. ∑ H*U in the time of can also obtaining the base station information of sending is carried out precoding HAfter channel matrix after handle conjugate transpose the base station carries out the conjugate transpose processing, can handle, obtain pre-coding matrix, i.e. (∑ H*U the inverse matrix of pre-coding matrix H) -1Afterwards, the base station can use pre-coding matrix that the information of sending is carried out precoding processing, and sends the signal that obtains after the precoding processing to subscriber equipment, for example: X=(∑ H*U H) -1S.
Behind the own corresponding decoding matrix of subscriber equipment acquisition, use the information of decoding matrix decoding correspondence oneself.
Corresponding to the method that provides of above-mentioned decoding matrix, the present invention also provides a kind of base station, is used for sending information in the MU-MIMO system to subscriber equipment, after subscriber equipment transmission information, sends decoding matrix to subscriber equipment.As shown in Figure 6, this base station comprises: acquiring unit 601 is used to obtain the corresponding down channel matrix of each subscriber equipment; Matrix assembled unit 602 is used for the down channel matrix group of obtaining is combined into channel matrix; The first conjugate transpose processing unit 603 is used for that said channel matrix is carried out conjugate transpose and handles; Matrix decomposition unit 604 is used to use piece diagonal angle singular value decomposition method, and the channel matrix after conjugate transpose is handled decomposes; The second conjugate transpose processing unit 605; Being used for that the channel matrix after the conjugate transpose processing is carried out conjugate transpose handles; Obtain unitary matrice, comprise the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment; Decoding matrix provides unit 606, is used for each block diagonal matrix is offered corresponding subscriber equipment.
Acquiring unit 601 specifically can obtain the corresponding down channel matrix of each subscriber equipment through the measurement feedback of subscriber equipment.If the MU-MIMO system is based on the TDD system, then acquiring unit 601 can obtain the corresponding down channel matrix of each subscriber equipment through the uplink and downlink heterogeneite in the TDD system.
Because this embodiment is corresponding with the embodiment that method is provided of above-mentioned decoding matrix; So; The specific descriptions of the function of each unit in the base station and the relation of cooperatively interacting can repeat no more referring to the associated description among the embodiment that method is provided of above-mentioned decoding matrix here.
In sum, use embodiment of the invention technical scheme, use piece diagonal angle singular value decomposition method that channel matrix is decomposed; Wherein, Through the unitary matrice that decomposition obtains, comprise the block diagonal matrix identical on its diagonal with subscriber equipment quantity, each block diagonal matrix information is offered corresponding user equipment respectively; Each subscriber equipment can adopt resulting diagonal matrix information to carry out precoding or decoding processing respectively, makes the performance of MU-MIMO system improve.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium; This program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-OnlyMemory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (15)

  1. A pre-coding matrix method is provided, be applicable to subscriber equipment in multi-user's multiple-input and multiple-output MU-MIMO system before base station transmission information, the base station provides the scene of pre-coding matrix to subscriber equipment, it is characterized in that said method comprises:
    The base station obtains the corresponding up channel matrix of each subscriber equipment;
    Said base station is combined into channel matrix with the up channel matrix group of obtaining;
    Piece diagonal angle singular value decomposition method is used in said base station, and channel matrix is decomposed, and obtains unitary matrice, comprises the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, and the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment;
    Said base station offers corresponding subscriber equipment with the column element in each block diagonal matrix or each block diagonal matrix.
  2. 2. the method for claim 1; It is characterized in that; The base station obtains the corresponding up channel matrix of each subscriber equipment and comprises: the base station utilizes the channel measuring method of subscriber equipment full range band pilot signal transmitted, obtains the corresponding up channel matrix of each subscriber equipment.
  3. 3. the method for claim 1 is characterized in that, said diagonal angle singular value decomposition method comprises:
    For dimension is the channel matrix H of M * N, will gather 1 ..., N} is divided into K mutually disjoint subclass μ k, obtain
    Figure FSA00000170719300011
    Wherein, M, N and K are positive integer, and K is the quantity of subscriber equipment, N 0=0, N k=N, N kBe positive integer less than N;
    H is carried out obtaining after the piece diagonal angle singular value decomposition:
    H＝U∑V H，
    Wherein, U is the unitary matrice of M * M, and V is the unitary matrice of N * N, and V is a block diagonal matrix, and ∑ is the upper triangular matrix with block diagonalization character of M * N;
    V is expressed as:
    Figure FSA00000170719300012
    Wherein,
    Figure FSA00000170719300021
    For with μ kCorresponding unitary matrice;
    ∑ is expressed as:
    Figure FSA00000170719300022
    Wherein,
    Figure FSA00000170719300023
    For with μ kCorresponding diagonal matrix, * be the sub-piece of non-zero;
    Obtain at last:
    Figure FSA00000170719300024
    Figure FSA00000170719300025
  4. 4. method as claimed in claim 3; It is characterized in that, obtain
    Figure FSA00000170719300026
    and ∑ in the following manner:
    S1: make k=1, H=H, P are unit matrix, preserve original channel matrix H t=H;
    S2: H is divided into two parts, obtains
    Figure FSA00000170719300027
    Figure FSA00000170719300028
    The expression H in μ kCorresponding column vector,
    Figure FSA00000170719300029
    Remove and μ among the expression H kOther column vectors of respective column;
    S3: carried out singular value decomposition SVD, obtain
    S4: obtain
    Figure FSA000001707193000212
    Figure FSA000001707193000213
    Wherein, U t(:, 1:length (μ k)) the 1st among the representing matrix Ut be to length (μ k) row, length (μ k) for gathering μ kSize;
    S5: order
    Figure FSA000001707193000214
    k = k +1;
    S6: if H is not empty or k≤K, then return S2, otherwise, change S7;
    S7: obtain ∑=U H* Ht*V.
  5. 5. the method for claim 1; It is characterized in that, the column element in each block diagonal matrix is offered corresponding subscriber equipment comprise: all elements in the row at the element place that the value on the diagonal in each block diagonal matrix is maximum offers corresponding subscriber equipment.
  6. 6. a base station is used for receiving the information that subscriber equipment sends in multi-user's multiple-input and multiple-output MU-MIMO system, before the information that receives the subscriber equipment transmission, to subscriber equipment pre-coding matrix is provided, and it is characterized in that said base station comprises:
    Acquiring unit is used to obtain the corresponding up channel matrix of each subscriber equipment;
    The matrix assembled unit, the up channel matrix group that is used for said acquiring unit is obtained is combined into channel matrix;
    The matrix decomposition unit is used to use piece diagonal angle singular value decomposition method, and the channel matrix that said matrix assembled unit is formed decomposes, and obtains unitary matrice, comprises the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice;
    Pre-coding matrix provides the unit, and each block diagonal matrix or the column element in each block diagonal matrix of the unitary matrice that is used for said matrix decomposition unit is obtained offer corresponding subscriber equipment.
  7. 7. base station as claimed in claim 6 is characterized in that, said pre-coding matrix provides all elements in the row that the unit specifically is used for the element place that the value on the diagonal of each block diagonal matrix is maximum to offer corresponding subscriber equipment.
  8. A decoding matrix method is provided, be applicable to base station in the MU-MIMO system after subscriber equipment transmission information, the base station provides the scene of decoding matrix to subscriber equipment, it is characterized in that said method comprises:
    The base station obtains the corresponding down channel matrix of each subscriber equipment;
    Said base station is combined into channel matrix with the down channel matrix group of obtaining;
    Said base station is carried out conjugate transpose with said channel matrix and is handled;
    Piece diagonal angle singular value decomposition method is used in said base station, and the channel matrix after conjugate transpose is handled decomposes;
    Channel matrix after handle conjugate transpose said base station carries out conjugate transpose to be handled, and obtains unitary matrice, comprises the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, and the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment;
    Said base station offers corresponding subscriber equipment with each block diagonal matrix.
  9. 9. method as claimed in claim 8 is characterized in that, the base station obtains the corresponding down channel matrix of each subscriber equipment and comprises: said base station obtains the corresponding down channel matrix of each subscriber equipment through the measurement feedback of subscriber equipment; Perhaps,
    If the MU-MIMO system is based on TDD system, then said base station obtains the corresponding down channel matrix of each subscriber equipment through the uplink and downlink heterogeneite in the TDD system.
  10. 10. method as claimed in claim 8 is characterized in that, said diagonal angle singular value decomposition method comprises:
    For dimension is the channel matrix H of M * N, will gather 1 ..., N} is divided into K mutually disjoint subclass μ k, obtain
    Figure FSA00000170719300041
    Wherein, M, N and K are positive integer, and K is the quantity of subscriber equipment, N 0=0, N k=N, N kBe positive integer less than N;
    H is carried out obtaining after the piece diagonal angle singular value decomposition:
    H＝U∑V H，
    Wherein, U is the unitary matrice of M * M, and V is the unitary matrice of N * N, and V is a block diagonal matrix, and ∑ is the upper triangular matrix with block diagonalization character of M * N;
    V is expressed as:
    Figure FSA00000170719300042
    Wherein,
    Figure FSA00000170719300043
    For with μ kCorresponding unitary matrice;
    ∑ is expressed as:
    Figure FSA00000170719300044
    Wherein,
    Figure FSA00000170719300045
    For with μ kCorresponding diagonal matrix, * be the sub-piece of non-zero;
    Obtain at last:
    Figure FSA00000170719300046
    Figure FSA00000170719300047
  11. 11. method as claimed in claim 10; It is characterized in that, obtain
    Figure FSA00000170719300048
    and ∑ in the following manner:
    S1: make k=1, H=H, P are unit matrix, preserve original channel matrix H t=H;
    S2: H is divided into two parts, obtains The expression H in μ kCorresponding column vector, Remove and μ among the expression H kOther column vectors of respective column;
    S3:
    Figure FSA00000170719300054
    carried out singular value decomposition SVD, obtain
    Figure FSA00000170719300055
    S4: obtain
    Figure FSA00000170719300056
    Figure FSA00000170719300057
    Wherein, U t(:, 1:length (μ k)) the 1st among the representing matrix Ut be to length (μ k) row, length (μ k) for gathering μ kSize;
    S5: order
    Figure FSA00000170719300058
    k = k +1;
    S6: if H is not empty or k≤K, then return S2, otherwise, change S7;
    S7: obtain ∑=U H* Ht*V.
  12. 12. method as claimed in claim 11 is characterized in that, the channel matrix after handle conjugate transpose said base station carries out after conjugate transpose handles, the inverse matrix of employed pre-coding matrix when also obtaining said base station the information of sending being carried out precoding;
    After channel matrix after handle conjugate transpose said base station carries out the conjugate transpose processing, the inverse matrix of pre-coding matrix is handled, obtained pre-coding matrix;
    Said base station uses pre-coding matrix that the information of sending is carried out precoding processing, and sends the signal that obtains after the precoding processing to subscriber equipment.
  13. 13. method as claimed in claim 12 is characterized in that, the channel table after said conjugate transpose is handled is shown H H=U* ∑ * V H, wherein, V is a unitary matrice;
    After channel matrix after handle conjugate transpose said base station carries out the conjugate transpose processing, obtain H=V* ∑ H*U H, wherein, ∑ H*U HInverse matrix for pre-coding matrix.
  14. 14. a base station is used for sending information in multi-user's multiple-input and multiple-output MU-MIMO system to subscriber equipment, after subscriber equipment transmission information, sends decoding matrix to subscriber equipment, it is characterized in that said base station comprises:
    Acquiring unit is used to obtain the corresponding down channel matrix of each subscriber equipment;
    The matrix assembled unit is used for the down channel matrix group of obtaining is combined into channel matrix;
    The first conjugate transpose processing unit is used for that said channel matrix is carried out conjugate transpose and handles;
    The matrix decomposition unit is used to use piece diagonal angle singular value decomposition method, and the channel matrix after conjugate transpose is handled decomposes;
    The second conjugate transpose processing unit; Being used for that the channel matrix after the conjugate transpose processing is carried out conjugate transpose handles; Obtain unitary matrice, comprise the block diagonal matrix identical with subscriber equipment quantity on the diagonal of said unitary matrice, the block diagonal matrix on the diagonal is corresponding one by one with subscriber equipment;
    Pre-coding matrix provides the unit, is used for each block diagonal matrix is offered corresponding subscriber equipment.
  15. 15. method as claimed in claim 14 is characterized in that, shown in acquiring unit obtain the corresponding down channel matrix of each subscriber equipment in the following manner:
    Through the measurement feedback of subscriber equipment, obtain the corresponding down channel matrix of each subscriber equipment;
    Perhaps,
    If the MU-MIMO system based on TDD system, through the uplink and downlink heterogeneite in the TDD system, obtains the corresponding down channel matrix of each subscriber equipment.
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